Hatler's chums run Blackberry Wood
It's at the foot of the South Downs, near Ditchling. Fires allowed AIUI. Website's a bit crap though.
Indeed they do. Fires allowed, dogs have to be on a lead. Great on and off road cycling one yard from the entrance. A number of good pubs within two or three miles.
Site is limited to 20 pitches in either open areas or glades. There's a shower block.
However, they are generally fully booked for all weekends, bank holidays, half terms and school holidays a year in advance; BUT, they often have cancellations on a Friday, so a call to them on a Friday will often bear fruit.